CEMENT

Portland Cement - ORDINARY GREY PORTLAND CEMENT 42.5 R - BS 12/1996 OR DIN EN 197-1:2000 OR ASTM C-15 Portland cement (often referred to as OPC, from Ordinary Portland Cement) is the most common type of cement in general use around the world because it is a basic ingredient of concrete, mortar, stucco and most non-specialty grout. It is a fine powder produced by grinding Portland cement clinker (more than 90%), a limited amount of calcium sulfate (which controls the set time) and up to 5% minor constituents as allowed by various standards There are two types of gray Portland cement: TS EN 197-1-CEM I with 42.5R and 52.5N standards. The strength of these types depends on the high amount of C3S in the cement. These are the most popular cement types, especially in the high strength concrete class and in the construction of tall buildings. It is popular in pre-stretched prefabricated applications in particular, tunnel mould systems and in the construction of mass housing.

TYPICAL PROPERTIES

PHYSICAL REQUIREMENTS

Requirement as per

IS:12269:1987

Unit

Laboratory Test Result

Fineness

Specific Surface

225 ( Min )

m2/kg.

325

STANDARD CONSISTENCY

%

31.50

Setting time

(1) Initial

(2) Final

30 ( Min )

600 ( Max )

Minutes

Minutes

125

175

Soundness Expansion measured by

(1) Le - chatelier Method

(2) Auto Clave

10.0 ( Max )

0.80 ( Max )

m.m.

%

1

0.12

Compressive Strength

(1) 72 Ã‚± 1h (3 Days)

(2) 168 Ã‚± 2h (7 Days)

(3) 672 Ã‚± 4h (28 Days)

27 ( Min )

37 ( Min )

53 ( Min )

Mpa

Mpa

Mpa

50

61

72

CHEMICAL REQUIREMENTS

Lime Saturation Factor

0.80 to 1.02

Ratio

0.90

Alumina Iron Ratio

0.66 ( Min )

Ratio

1.36

Insoluble Residue(by mass)

3.0 ( Max )

%

0.89

Magnesia(by mass)

6.0 ( Max )

%

1.32

Sulphuric Anhydride(by mass)

3.0 ( Max )

%

1.76

Loss on ignition

4.0 ( Max )

%

1.02

Chloride Content(by mass)

0.10 ( Max )

%

0.035

The above cement complies with the requirement of IS : 12269 : 1987 For 53 Grade Ordinary Portland Cement